It is pretty bad.
ok now it's time for my in-depth review.
I was recently watching a Television Disney Movie only to realize, to my dismay, I was actually watching a full-feature film with a budget of over one-hundred million dollars! Terminator 3's movie quality isn't bad, but it is absolutely mediocre to the lowest point. The film is self-aware, which is really mysterious and unfitting, but damn it I still laughed occasionally.
The acting in this movie may just be the worst acting in a movie (specifically a movie with a budget of almost two-hundred million dollars) yet. John Connor doesn't even speak throughout the entire film! I continuously heard him utter heavy breathing constantly instead of actual dialogue. Watching a clip of any part of the film will be enough evidence. Arnold's acting was good for the most part, but I couldn't help but notice that he seems so unenthusiastic again and again. I recently found out that he plays a robot in the entire movie, but in the first two he didn't sound as retarded to speak.